Compatibility Jazzy 1100 Jazzy 1101 Jazzy 1103 Jazzy 1103 Ultra Jazzy 1104 Jazzy 1105 Jazzy 1113 Jazzy 1113 ATS Jazzy 1115 Jazzy 1121 Jazzy 1121 HD Jazzy 1133 Jazzy 1143 Jet 2 / 2 HD Jet 3 Jet 7 Jet 10 . The VSI Controller is a fully programmable, integral electronic controller system that allows you to operate your power chair. It is designed to allow the user to have complete control over chair movement and speed. The controller has 4 flying leads, (4 plugs) as shown.